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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 4    August 2002

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Effect of coating repair on microstructure
and mechanical properties of Ni3Al
based alloy IC6
LI Shu-suo(李树索)1,HAN Ya-fang(韩雅芳)1, 2,XIAO Cheng-bo(肖程波)2,
SONG Jin-xia(宋尽霞)2, LI Jian-ping(李建平)2

1. Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:The effect of coating repair on microstructure and mechanical properties of a directionally solidified nickel base alloy IC6 was studied. The experimental results show that after coating repair treatment, the substrate/coating interface keeps well, and the combination of coating and substrate is very good , as well as very slight mutual diffusion of alloying elements between substrate and coating occurred. Although coating repair treatment make diffusion time double, only a little amount of Mo diffused into coating, and the elements Cr and Co of NiCoCrAlYHf coating only exist in a thin layer of influence region of the substrate, which has no obvious effect on the microstructure of alloy IC6. Tensile tests at room temperature and stress rupture tests under 1100℃, 90MPa of the coating-repaired sample were conducted. The results show that the coating repair has no evident effect on mechanical properties. Therefore, it may be considered that when the coating is unexpectedly destroyed, it can be repaired.

 

Key words: nickel aluminides;coatings; aero-engine components

ISSN 1672-7029
CN 43-1423/U

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